Halogen-free resin composition, insulated wire and cable

Abstract

A halogen-free resin composition includes an engineering plastic as a main component including an aromatic ring. A thermal weight-change rate measured by a thermogravimetry (under conditions that a dry air as a purge gas is introduced and that heating is conducted from 40° C. at a temperature rise rate of 10° C. / min) is not less than −60% when it is 430° C.

Description

[0001]The present application is based on Japanese patent application No. 2013-179346 filed on Aug. 30, 2013, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a halogen-free flame-retardant resin composition as well as an insulated wire and a cable that include a covering layer including the resin composition.[0004]2. Description of the Related Art[0005]Electric wires or cables which are disposed near an engine or motor in railroad rolling stocks or automobiles etc. are required to have characteristics such as heat resistance, abrasion resistance and flame retardancy on an as-needed basis. In order to meet such requirements, engineering plastics having high melting point etc. are sometimes used. It is known that halogen-based or phosphorus-based flame retardants are used to allow the flame-retardancy of the engineering plastics.[0006]However, halogen-based flame retardants produ...

AI Technical Summary

Benefits of technology

The patent provides a way to make a resin that doesn't contain halogens and will form a layer of char when it catches fire, which helps to stop the fire from spreading. This type of resin is useful for making insulated wires and cables.

Problems solved by technology

However, halogen-based flame retardants produce a halogen gas at the time of combustion and use thereof thus exhibits a lack of concern for globally growing environmental issues.

Meanwhile, phosphorus-based flame retardants such as red phosphorus generate phosphine at the time of combustion or produce phosphoric acid when discarded, raising concerns of groundwater contamination.

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